bin/post (SimplePostTool) should stream/chunk if size not known

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Description

SimplePostTool.postData() takes a Long length arg that is sometimes null – for stdin and for processing some web pages for links. If it's null, we should this on the underlying HttpURLConnection:urlc.setChunkedStreamingMode(-1);. I have found that I can't use bin/post to stream large files from stdin since it the JDK's implementation wants to put the whole thing in memory first. Sadly this is true of curl as well. When I set chunk mode, it works. (FYI -1 tells it to use its default chunk size – 4k).